Shears



`bill rita i it.

n'rcoLAs rAzos, or HABANA, CUBA.

j snsARs.

Applicatibn leaAprii 9,

. To all'wwm t may concern.'

Be it known that l, NicoLs PAzos, a subject of the King of Spain, andresident of Habana, Cuba (whose postal address is #r3 Matadero Street,Habana, Cuba),`have invented Vcertain new and useful YImprovements inShears, of which the followingis a specification. Y

`This invention relates to shears which can be used for `cutting metalsheets and provided with means for the purpose ofv cutting wires anditsmain object is to provide a shear construction which renders themcapable of cuttingsheets of anyfthickness and length by hand pressureand whose j handles can be operated above the sheet cut by the shearswithout the continued pressure exerted to cut the sheet which may tirethe muscles of the hand operating the handles.

Another object of the invention is to provide shears capable of cuttingsheets of any thickness without the sections of sheet cut being-rolledup during the cutting op eration as it happens when cutting sheet metalwith the 'shears at present in use, thus obtaining a perfect cleancutting.

`A further object of the invention isto provide a tool capable of beingeasily and eiiciently handled by the operator.

Still a vfurther object of the invention is to provide a shear. havingan oscillating shear blade which is caused to be actuated j forward bymeans of compressing and 3-3 of Fig. l.

guiding `members and cam actuatingmembers and caused to `fall back to'inoperative position through the samemeans.

Other advantages and different considerations will become evident tothose expert Fig.` 5 is a perspective view in" partial detail of theupper handle of the shears.`

Fig. 6 is a perspective view in detail of Athe oscillating shear blade.

Fig.r7 isa perspective viewV in partial detail of the lower handlemember and integral shear blade.

1921. serial no. 459,939.

Fig. 8 is a perspective view in detail of the guide block and slidingfor the oscillating blade.

Fig. 9 is a perspective partially cut olf view of the shears showing itin the operation of cutting a metal sheet. Y

The shears forming the subject matter of this invention comprises anupper handle member 1 which isv curved downward to the front andterminates in a widened front end or head 2 provided at its lower rearpart with curved projections 3, and on its lower front part of curvedrecesses 22 terminating in stops 23. Handle 1 is longitudinally hollowedas shown in Fig. 9 forming at its head 2 a recess 4. rl`he lower handlemember 5 of the shears is also curved downwards to the front andterminates on a forked end whose upperfork 6 is raised and lodges inrecess 4 being connected therein by means of a pivotal pin 7 passingthrough holes 8 and 9 in the upper fork 6 and walls of recess 4respectively. The lower fork of the fork constitutes a horizontal shearbla'de`10 which is not in the same vertical plane as fork 6 but projectsout angularly to the same as illustrated in Figs. 3 and 7 of thedrawings and on the rear part thereof there is a low cut 11 with theObject that will be hereinafter explained. Between the upper fork 6 andthe front end of handle 1 is arranged a two branch spring 12 which islodged in therecess of said handle and rests its upper branch on theupper wall of recess 4 and its longer lower branch bears against theupper edge of branch 6 of the handle member 5.

Cooperating with the shear blade 10 there is a rocking shear blade 13whose lower edge is sharp and which has its rear part angularly bent outwith respect to its forward portion which is of trapezoidal shape, saidrearfpart bearing on the union portion of the two branches 6 and 10 andbeing connected therein by means of a pivotal pin 14 passing throughholes 15 and 16 existing respectively in that portion of the handlemember 5 and blade 13. At the rear part of blade 13 there is a finger orraised shoulder 17 designed to slide on the surface ofthe curvedrecesses 3 of head 2 nwhich substantially constitute cams and an :will

upper edge and parallel theretoa slot l19 in which slot can run in areciprocating manner a pin 20 lined through holes 21 on the lower partof recess f1 `and belowsaid slot in advanced position theretol thereis'a horizontal pin 24 fixed to blade 13 whichis adapted to slide inrecesses 22 of head 2. ln recess l there is guiding block 25 detailed inFig. 8 whose lower face is plane said block being arranged below thebranch 6 and in frictional Contact vwith the upper edge of blade 13being securedin position therein by means of a pivotal pin 26 passingthrough holes 27 and 25 on the sides of recess 4 and on the same blockrespectively. Blade 13 is finally articulated with respect to each sideof head 2, ezrteriorly thereto, by means of two links 28 articulated atits ends byV pivotal pins passing through holes 29 and 30 von head 2 andblade `13 respectively. y

In Fig. 9 of the drawings is illustrated the manner of operating theseshears 4and it can be observed how the described arrangement of thehandle .members l and 5 permit to be invariably above the sheet to becut, which is a glreat ailvantage and yease for the operator as it willbe readily understood by those expert in the art and it also aids to thecleaner cutting of the sheet preventing the rolling up of the sectionscut.. Thus, therefore, in said figure is represented the shears cuttinga metalV sheet 31 the shear blades 10 and 13 effecting the cuttingperfectlyT right as'indicated in 32 the handles 1 and 5 being arrangedabove the sheet 31.

Finger 17 on sliding up -onv the surface l of recesses 3, the linedhorizontal pivot 24 when sliding on the surface of the curved recesses22 and block 25 friction'ally bearing` on the upper edge of the rockingyblade 13 as well as the links 28 will cause the multiplication of thepressure exerted on the handle members 1 and 5 the said advancingmovement being guided* by pivot V20 reciprocally sliding along thehorizontal slot 19 and the metal sheet being thus cut, r evenif itsthickness begreater than that ofthe sheetsc'ut with. the shears atpresent in use.

The spring of branches 12 will cause all parts to fallback to their4initial position and will :keep the shear blades 10 and 13 'the sameaction of the members before menztioned.

It is evident that di'ere'nt changes can be made vrin the constructionofthe `described n shears as .well .as to' do awayfwthyslertain of theconstituting parts according to the member leading downwardlyforward-and terminating ma `head or widened front end, hollow in itsunder side,'4 aV lower handle member leading downwardly forwardterminating in a forked fore end whose upperbranch is pivoted inthehollow head of the upper handle member and having a lower branchwhich forms a horizontal shear blade in different Vertical plane withthe upper branch; a rocking shear V.blade pvotedf at the junction. point"of the y. two

fork branches of the lower handle cooperat' ing with the horizontalshear blade; a connection sliding` `reciprocally between the head of theupper handle member andthe rocking blade and a springinterposed be tweenthe two upper and lowerV handle members. v 1

2. A shear comprising anfnpper handle 4 member longitudinally hollowedleading downwardly forward terminating in i ahead or widened fore endhaving curved Vprojecttions on its lower rearpart; a lower handle memberforwardly inclined and terminating in a fork end whose upper branch israised and is pivoted in the recess of .the` head of the upper handleand having a lower branch which constitutes a shear'blade arranged indifferent vertical planes to thev upper branch; a shear blade pivoted at.the junction point pf both branchesof the forli` in which terminatesthe lower handle and whose rear part is an'gularly bent outwards; ashoulder on the rear partof therecling blade which lactuates`reciproca-ily on the curvedl surface of therecesses in the lower rearpart' of the head of the upperhandle; a reciprocating sliding connectionbetween the rocking blade and the head of the upper handle and afspringinterposed between the upper handle and the lower handle of the shear.Y. i i i 3. A shear comprising an upper .handle memberV longitudinallyhollow'ed .leading downwardly forward and terminating in a head orwidened fore end provided with curve projections atitsrear lower partand curved recesses terminatedin stop shoulders at its lower fore part;a lower 4handle member leading downwardly forward terminating inarvforlred Aend whose upper branch is raised being pivoted at its end inthehol'low portion of the head of the upper handle member and its lowerbranch forms ahori-l zontal1 shear blade which is notfini -thefsame dlemember; a horizontal pin vertical plane as the upper branch; a rockingshear' blade pivoted at the junction point of the two branches of thefork and whose rear part is bent angularly with respect to its frontpart and has a raised shoulder of finger actuating slidably on thesurfaces of the recesses at the lower rear part of the head of the uppershear member; a reciprocally sliding connection between the rockingshear blade and the head of the upper haniixed at the front part of therocking shear blade and slidable on the curved recesses in the lowerfront part of the head of the upper handle member; and a springinterposed between the upper and lower handle members.

4. A shear comprising a longitudinally hollowed upper handle memberextending downwardly forward and terminating in a front enlarged head orend provided with curved projections at its rear part and of curvedrecesses terminating in stop shoulders at its lower front part; a lowerhandle member extending downwardly forward terminating in a fork endwhose upper branch is raised being pivoted at its end in the hollow ofthe head of the upper handle member and its lower branch constitutes ahorizontal shear blade which is not in the same vertical plane as theupper branch; a rocking shear blade pivoted on the junction point of thetwo branches of theJ fork and whoserear part is bent angularly withrespect to its front part and has a raised shoulder or nger slidablvactuating on the surface of the curved recesses at the rear lower partof the upper handle member; a horizontal pin fixed on the front part ofthe rocking blade adapted to slide on the surface of the curved recessesin the lower front part of the head of the upper handle member; a blockwhose lower face is plane and is in continued frictional contact withthe upper edge of the rocking blade lodged in the recess on the head ofthe upper handle member and piv- `blade and the head of oted therein; areciprocating sliding connection between the rocking shear blade and thehead of the upper handle member and a spring interposed between theupper and lower handle members.

5. A shear comprising a longitudinally hollowed upper handle memberextending downwardly forward and terminating in a front enlarged head orend provided with curved projections at its lower rear part and ofcurved recesses on its lower front part which terminate in stopshoulders; a lower handle member extending downwardly forward terminatedin a forked end whose upper branch is raised being pivoted on its frontend in the hollow of the head of the upper handle member and its lowerbranch constitutes a horizontal shear blade which is not in the same`vertical plane as the upper branch; a rocking shear blade pivoted atthe junction point ofthe two branches of the fork and whose rear part isbent angularly with respect. to its front part having v rearwardly araised finger or shoulder adapted to slide on the surface of the curvedrecesses at the rear lower part of the upper handle member; a horizontalpin fixed at the front part of the rocking shear blade adapted to slideon the surface of the curved recesses at vthe front lower part of theupper handle member; a block whose lower face is plane and is incontinued frictional contact with the upper edge of the rocking shearblade lodged in the recess of the head of the upper handle member andpivoted therein; a connection of yslot and pivot reciprocally slidingtherein between the rocking shear the `upper handle member, -linkmembers respectively articulated to the head of the upper handle memberand to the rocking shear blade and a spring interposed between the upperand lower handle members.

In witness whereof I aflix ,my signature.

NICOLAS PAZOS.

